Suction valve



FIG. 1 is a front perspective view of a first embodiment of a suction valve;

FIG. 2 is a front view of the first embodiment thereof;

FIG. 3 is a rear view of the first embodiment thereof;

FIG. 4 is a side view of the first embodiment thereof; and,

FIG. 5 is a top view of the first embodiment thereof. 

CLAIM The ornamental design for a suction valve, as shown and described. 